Cognitive Testing on Mobile & Wearable Devices

Transcription

1 Cognitive Testing on Mobile & Wearable Devices Krystyna Zaluski CANTAB Connect Prodromal Alzheimer s Background Cambridge Cognition All rights reserved Page 1

2 Overview A neuroscience digital health company - Measuring cognition accurately Validated by over 30 years of neuroscience research A measure of cognitive function in over 100 indications Trusted by the world s top pharmaceutical companies

3 Technology Platforms for Cognitive Testing Research tools Tools for clinical and research trials to detect effects of drugs and environmental changes At-home testing Cognitive tests that can be completed by participants at home High Frequency testing Frequent monitoring of cognitive ability using wearable devices In-clinic tools Cognitive assessments for clinical use that can identify those who require further investigation Neuroanalytics Consultancy We provide expertise in the design, analysis and interpretation of neuropsychological endpoints in cognitive studies and clinical trials with extensive experience using research and analytic approaches.

4 Overview CANTAB C O G N I T I V E S C I E N C E CANTAB has been used to assess over 250,000 Participants worldwide

5 Specific to Cognitive Domain

6 Specific to Neural Mechanisms Digital Biomarker Reaction Time Rapid Visual Information Processing Spatial Working Memory Episodic Memory

7 Worse performance score Sensitive to Disease State Cognitive Signature diagnosis AD MCI PD 1 0 AT_cat EF_cat EM_cat PS_cat WM_cat Attention Executive Function Episodic domain Memory Processing speed Working Memory

8 Cognition is subject to daily fluctuations

9 How to measure Cognition in the real world

10 Daily assessment across platforms and devices software enables an individual to complete an assessment on a range of mobile and wearable devices without having to visit a clinic or be helped by a health care professional. Drawing tasks to measure memory and executive function. Emotional recognition tasks to measure social cognition. N-back tasks to measure memory and attention.

11 Best Practice Approach Decisions are made with the individual in mind Patient Experience Cog Test Validity Cognitive test selection and adaptation designed with scientific rigor Large Data Sets of objective cognitive measurement and passive data points Meaningful Data

12 Validation Process Page 12

13 Developing a cognitive test for high-frequency testing N-back task activates a network of areas in the brain including frontal and parietal regions (Owen et al., 2005). There is significant variation across and within days on n-back performance, partly linked to mood and motivation (Brose et al., 2012). Rose & Ebmeier. Journal of affective disorders 90 (2006): Owen et al., Human brain mapping 25 (2005): Brose, Schmiedek, Lövdén & Lindenberger. Emotion 12 (2012): 605.

14 Phase 1: Proof of concept study in healthy volunteers Study design: 10 (4 females) aged Sensor data (heart rate, skin temperature, GSR) measured continuously between CANTAB tasks (SWM, RVP, AST, ERT) and the PANAS administered each day after 1700 Cognitive & mood assessment scheduled hourly Presentation = 600 ms ISI = 600 ms 2-back match Cormack et al, AAIC 2016

15 Baseline performance AST.correct RVPA RVP.False.Alarm age SWM.Errors linear intercept Phase 1: Detailed cognitive data 1-minute micro-tests capture meaningful across-time variation and correlate with gold-standard computerised tests. Revealed issues with device and dynamic range of the test. intercept 1 r= 0.52 linear age SWM.Errors v RVPA RVP.False. Alarm age AST.correct Cormack et al, AAIC 2016

16 Phase 2: Design refinement using web-based testing Findings from phase 1: A number of participants rapidly reached ceiling People were giving symbols names verbal recording of the stimuli, and familiarity with symbols over time Issues with the device used in the proof-of-concept: battery life, limited display, discontinuation Questions for phase 2: Change of symbol design and larger bank of symbols to reduce availability of verbal strategies Could we titrate the difficulty level without increasing the n: role of symbol complexity, timing parameters, and number of symbols Decision to use Apple iwatch

17 Phase 2: Participant Experience Refining task to increase dynamic range Converted task for web-based testing with redesigned stimuli Crowd-sourced A-B testing using Amazon m-turk Series of experiments exploring the impact of task parameters on participant performance using: Presentation time Symbol design Number of unique symbols n = 994 participants aged in total n = 88 also completed CANTAB Spatial Working memory test and CANTAB PAL (episodic memory)

18 Phase 2: Cognitive Test Validity Iterative A-B experimentation determined: Significant effect of stimulus presentation time on performance Significant impact of number of symbols in trial Symbol design (e.g. number of segments + arrangement) did not significantly impact performance r=-0.41 P<0.001 Correlations with CANTAB test significant association with SWM, but not PAL. r=-0.10 P=0.37 Confirms sensitivity to working memory performance.

19 Phase 3: In-person testing and iterative design Would the same parameters work on the watch? How would participants perform over an extended time? Is the paradigm and testing schedule tolerable? What are some of the barriers to compliance? How can we make sure that patients understand the app and the tasks? N=7 subjects over 3 weeks. Apple watch N-back testing x3 times a day

20 Cognitive Testing on Mobile & Wearable Devices CANTAB Connect Prodromal Alzheimer s Background Cambridge Cognition All rights reserved Page 20